Cheap flights from Ontario to the United States from $30
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to the United States departing on 2/22. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
Round-trip
1 adult
Economy
0 bags
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Cheap round-trip flights
These are some of the best round-trip flight deals from Ontario to the United States that have been recently found on momondo from popular airlines, departing in the coming months.
Cheap one-way flights
Flying one-way? These are some of the best deals recently discovered on momondo for flights from Ontario to the United States.
Cheap last minute flights
Planning a quick getaway from Ontario to the United States? These are the last-minute flight deals available now.
Cheap direct flights
If you prefer a non-stop journey, check out our latest direct flight deals to the United States, so you can enjoy a seamless trip without layovers.
Cheap bus & train deals from Ontario to the United States
Find recent round-trip train or bus tickets from Ontario to the United States.
All round-trip flight deals to the United States
The cheapest plane tickets to the United States found on KAYAK recently.
Frontier flights from Ontario to United States
Our best Frontier deals on Ontario to United States flight tickets
Frontier![Frontier]()
Jan 24![Frontier]()
Jan 24
ONT6:00 amOntario
1h 35m
SFO7:35 amSan Francisco
SFO10:03 pmSan Francisco
1h 28m
ONT11:31 pmOntario
Frontier![Frontier]()
Apr 21![Frontier]()
Apr 26
ONT9:41 pmOntario
1h 14m
LAS10:55 pmLas Vegas Harry Reid Intl
LAS6:20 amLas Vegas Harry Reid Intl
1h 03m
ONT7:23 amOntario
United Airlines flights from Ontario to United States
Our best United Airlines deals on Ontario to United States flight tickets
United Airlines![United Airlines]()
Jan 22![United Airlines]()
Jan 22
ONT10:47 amOntario
1h 33m
SFO12:20 pmSan Francisco
SFO4:35 pmSan Francisco
1h 29m
ONT6:04 pmOntario
United Airlines![United Airlines]()
Feb 8![United Airlines]()
Feb 10
ONT10:47 amOntario
1h 33m
SFO12:20 pmSan Francisco
SFO7:00 pmSan Francisco
1h 29m
ONT8:29 pmOntario
See travel insights to the United States from
How to get the cheapest flight ticket from Ontario to United States
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
Prices
Airlines
Other information
What is the cheapest month to fly to United States?
In general, January is the cheapest month to fly from Ontario to United States. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $274. If you aren’t able to travel during the month of January, then book flights to United States from Ontario during September instead. Flights to United States in September, while not as cheap as those in January, still average around $285.
What is the cheapest day to depart on your flight to United States?
According to our data, Wednesday is the cheapest day to fly to United States from Ontario. The lowest ticket price found for a Wednesday departure recently was $345. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. If your travel schedule is flexible, try to avoid departing on a Thursday because tickets tend to average around $392. These prices are subject to change though, so be sure to set up a Price Alert for flights to United States.
What is the cheapest time of day to depart on your flight to United States?
The cheapest time of day to fly to United States is in the afternoon when flights can be purchased for as low as $309. Try not to purchase tickets in the evening because they tend to be around $380. Of course, these prices can vary depending on the time of year and what airport you fly to.
What is the cheapest Ontario to United States flight route?
Fly from Ontario to Las Vegas Harry Reid Intl for the best Ontario - United States flight prices
How far in advance should I book a flight to United States?
Most flyers found that booking tickets 58 days in advance of their planned departure date is the best time to get cheap flights to United States. During this timeframe, flight prices are around $372. Keep in mind that you might be able to find cheaper flights to United States at any time. In fact, our users found flights for as low as $255 in the past 72 hours.
What cabin class options are available on Ontario to United States flights?
There are 4 cabin classes available to choose from on Ontario to United States flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
What is the cheapest airline that flies from Ontario to United States?
Frontier, United Airlines, and Southwest are the most popular carriers operating from Ontario to United States
What airlines fly to United States?
Frontier, Spirit Airlines and Delta are the top three most popular airlines that fly to United States from Ontario according to our data. Frontier is the first choice among our users, with 32% of people opting to fly with this airline when traveling to United States. Keep in mind that there are 12 different airlines that fly to United States on a routine basis, so you have a few additional options to choose from.
How many flights depart from Ontario to United States on average per day?
As of January 2025, there are 39 flights per day flying from Ontario to United States. The most common time of day flights depart is 6:00AM, with 44% of flights taking off at noon.
How many flights depart from Ontario to United States on average per week?
As of January 2025, there are 275 flights per week flying from Ontario to United States. The most common day of the week flights depart is Wed, with 17% of flights taking off on this day.
Cheap Ontario to United States flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Ontario to United States
Best Price Found | $30 |
|---|---|
Fastest flight time | 1h 05m |
Direct flights | Every day |
Airports in United States | 5 airports |
When did momondo last update prices for flights from Ontario Airport to United States?
Prices for flights from Ontario Airport to United States refresh daily.
How many operators does momondo search for flights from Ontario Airport to United States?
As of January 2025, there are 10 operators available to choose from for flights from Ontario Airport to United States.
How old do you have to be to fly from Ontario Airport to United States?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Ontario Airport to United States.
What documentation or ID do you need to fly to United States?
The necessary travel and health documents for your United States trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Ontario to United States?
Based on momondo bookings for flights between Ontario and United States, the leading plane model is Airbus A320neo, making up 25.10% of the total bookings. Other popular models include Airbus A321neo with 16.19%, Airbus A320 (sharklets) with 9.07%, and Airbus A321-100/200 with 7.75%.
Best airlines flying from Ontario to United States
Compare and see reviews for airlines that fly from Ontario to United States with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $31 | Free Cancellation | Rating 6.3 8,073 reviews | |||
| PriceFrom $38 | Free Cancellation | Rating 6.0 3,428 reviews | |||
| PriceFrom $38 | Free Cancellation | Rating 8.0 9,627 reviews | |||
| PriceFrom $78 | Free Cancellation | Rating 8.0 141 reviews | |||
| PriceFrom $83 | Free Cancellation | Rating 7.4 3,191 reviews | |||
| PriceFrom $85 | Free Cancellation | Rating 8.0 8,499 reviews | |||
| PriceFrom $124 | Free Cancellation | Rating 7.4 8,938 reviews | |||
| PriceFrom $176 | Free Cancellation | Rating 8.1 4,648 reviews | |||
| PriceFrom $177 | Free Cancellation | Rating 7.2 10,000 reviews |
Why use momondo?
Why should I use momondo to find a flight deal from Ontario to United States?
We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Ontario to United States for you.
Can I find flights from Ontario to United States with flexible booking policies on momondo?
Yes. All flights to United States from Ontario on momondo can be compared and filtered by various policies on offer, including flexible booking.
How can momondo help me find flights from Ontario to United States?
Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to United States from Ontario.
I’m not ready to book a flight from Ontario to United States right now. Can momondo alert me if prices change?
If you are simply researching potential flights to United States, momondo offers a useful price alert feature which will track prices for flights to United States from Ontario and alert you when they change.
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